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Permutation API
typedef unsigned int Uint;
class Permutation {
//construct identity of given order
explicit Permutation(Uint order);
//construct from init list
Permutation(std::initializer_list<Uint> list);
//construct from given range of Uint
template<class InputIt>
Permutation(InputIt first, InputIt last);
Uint order() const;
bool operator==(const Permutation& that) const;
Uint operator[](Uint index) const;
Permutation operator*(const Permutation& that) const;
//permute given range
template<class It>
void operator()(It first, It last) const;
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